CN213843575U - Diffractive optical element, zoned uniform light projection system, and electronic apparatus - Google Patents
Diffractive optical element, zoned uniform light projection system, and electronic apparatus Download PDFInfo
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Abstract
The utility model relates to a diffractive optical element, including the microstructure face, be provided with at least one micro-structure pattern unit on the microstructure face, diffractive optical element can receive the light beam that subregion light source array launches and throws out the light field on the target surface, wherein subregion light source array includes a plurality of light source arrays along the first direction spaced apart, and micro-structure pattern unit configures into and can disperse and the even light modulation along the first direction with the light beam that the light source in a plurality of light source arrays sent, makes adjacent light source array be in the light field region on the target surface borders on each other or overlaps in the first direction. The embodiment of the utility model provides an in, there is the clearance between the adjacent subregion, and light source subregion is lighted in turn, and when each light source subregion was lighted, only by the uniform lighting with the corresponding region in this subregion in the target light field, and when all subregions were lighted together, whole target light field was by the uniform lighting, does not have the dark space that arouses because of the clearance between the subregion, realizes the subregion uniform lighting in target light field.
Description
Technical Field
The present invention relates generally to the field of optical technology, and more particularly to diffractive optical elements, zoned uniform light projection systems including the same, and electronic devices including the same.
Background
At present, the Time-Of-Flight (TOF) scheme in the mobile phone industry is Indirect Time-Of-Flight (Indirect Time-Of-Flight), the distance Of a target object is calculated by using an Indirect scheme such as phase change Of a transmitting light field and a receiving light field, and compared with the Time-Of-Flight ranging Of a direct timestamp, the Indirect measurement has a large error such as converting into an average value when testing multiple targets, calculating a distance, and having a large influence on Indirect measurement Of environmental noise. These problems can be solved by using time-of-flight ranging directly with time stamps. Sony has designed a sensor for Direct Time-Of-Flight (Direct Time-Of-Flight) for this market demand, and in order to match this sensor operation, it is necessary to achieve zonal uniform illumination Of the light field. In addition, in many specific applications, it is desirable to provide a range of uniformly distributed light fields.
Vertical cavity surface emitting lasers VCSELs are widely used lasers. Some diffractive optical element DOE's dodging pieces are dodging light for the light field emitted by the whole VCSEL chip, but under the condition that the VCSEL chip has partitions and gaps exist between the partitions, the phase distribution of the DOE dodging pieces is calculated and designed for the whole emitted light field, which may cause the condition that the light field of the portion corresponding to the gaps between the partitions in the target light field region is not uniform with other regions, thereby affecting the reconstruction of 3D information.
The statements in the background section are merely prior art as they are known to the inventors and do not, of course, represent prior art in the field.
SUMMERY OF THE UTILITY MODEL
In view of at least one problem of the prior art, the present invention provides a diffractive optical element, including a microstructure surface, at least one microstructure pattern unit is disposed on the microstructure surface, and the diffractive optical element can receive light beams emitted by a partitioned light source array and project a light field on a target surface, wherein the partitioned light source array includes a plurality of light source arrays spaced apart along a first direction, and the microstructure pattern unit is configured to disperse and uniformly modulate light beams emitted by light sources in the plurality of light source arrays along the first direction, so that light field areas of adjacent light source arrays on the target surface are adjacent to or overlapped with each other in the first direction.
According to an aspect of the present invention, the plurality of light source arrays have a space along a second direction, the second direction being perpendicular to the first direction, wherein the micro-structure pattern unit is configured to diverge and dodge the light beams emitted by the light sources in the plurality of light source arrays along the second direction, so that light field areas of adjacent light source arrays on the target surface are adjacent to or overlap each other in the second direction.
According to an aspect of the present invention, the diffractive optical element has an optical power such that the light beam of each light source array diverges in the first direction and/or the second direction, and the microstructure pattern unit is configured to be optically uniform modulated in a divergence range.
According to an aspect of the invention, the diffractive optical element has different optical powers in the first direction and the second direction, such that the zonal light source array matches the proportion of the light field area on the target surface in the first direction and the second direction.
The utility model also provides an even light projection system of subregion, include:
a zoned light source array comprising a plurality of light source arrays having a spacing along a first direction;
the diffractive optical element is arranged in the optical path downstream of the subarea light source arrays and can receive the light beams emitted by the plurality of light source arrays and project a light field on a target surface.
The utility model also provides an electronic equipment, include as above the even light projection system of subregion.
The utility model also provides a design method of diffraction optical element, include:
obtaining a parameter of a zoned light source array, the zoned light source array comprising a plurality of light source arrays having a spacing along a first direction, the parameter comprising a width of the spacing along the first direction;
obtaining parameters of a target light field on a target surface, including a distance of the target light field from the partitioned light source array;
parameters of the diffractive optical element are calculated so that the diffractive optical element can diverge and dodge light beams emitted by light sources in the plurality of light source arrays along the first direction so that light field areas of adjacent light source arrays on the target surface abut or overlap each other in the first direction.
According to an aspect of the present invention, the plurality of light source arrays have intervals along a second direction perpendicular to the first direction, wherein the step of calculating the parameter of the diffractive optical element includes: parameters of the diffractive optical element are calculated so that the diffractive optical element can diverge and dodge the light beams emitted by the light sources in the plurality of light source arrays along the second direction so that light field areas of adjacent light source arrays on the target surface abut or overlap each other in the second direction.
According to an aspect of the present invention, the step of calculating the parameter of the diffractive optical element includes:
calculating a first phase profile of the diffractive optical element, the first phase profile providing optical power such that the light beams of each light source array diverge in a first direction and/or a second direction;
calculating a second phase distribution of the diffractive optical element, wherein the second phase distribution can enable the light beams of each light source array to be subjected to dodging modulation in the divergence range of the first direction and/or the second direction; and
the first phase distribution and the second phase distribution are superimposed.
According to an aspect of the present invention, the calculating the parameter of the diffractive optical element includes: and calculating different optical powers of the diffractive optical element in the first direction and the second direction according to the proportion of the subarea light source array in the first direction and the second direction and the proportion of the target light field in the first direction and the second direction, so that the subarea light source array is matched with the proportion of the target light field in the first direction and the second direction.
The utility model discloses still provide an optical modulation component, through the design method design as above.
The embodiment of the utility model provides an in, light source array can adopt a subregion, also can adopt two to be listed as the subregion, can provide different solutions respectively. Gaps exist between adjacent partitions, the light source partitions are lighted in turn, when each light source partition is lighted, only the area corresponding to the partition in the target light field is uniformly lighted, and when all the partitions are lighted together, the whole target light field is uniformly lighted, and dark areas caused by the gaps between the partitions do not exist, so that the partition uniform lighting of the target light field is realized.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 shows a schematic view of a zoned dodging projection system according to an embodiment of the present invention;
fig. 2 shows a schematic diagram of a front side of a zoned light source array according to an embodiment of the present invention;
FIG. 3 shows a close-up view of the partitioned array of light sources of FIG. 2, and illustrates how the diffractive optical element modulates the light exiting each light source;
FIG. 4 illustrates a light field distribution projected in accordance with a preferred embodiment of the present invention;
fig. 5 shows a schematic view of a front face of a zoned light source array according to another embodiment of the present invention, wherein the plurality of light source arrays have a spacing along both the first direction and the second direction;
FIG. 6 shows a close-up view of the zoned light source array of FIG. 5, and shows a schematic of the diffractive optical element modulating; and
fig. 7 illustrates a method of designing a diffractive optical element according to an embodiment of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Fig. 1 shows a schematic view of a zoned dodging projection system 100 according to an embodiment of the present invention. The zoned dodging projection system 100 includes a diffractive optical element 10 and a zoned light source array 20, wherein the zoned light source array 20 includes a plurality of light source arrays (refer to fig. 2) having a spacing in a first direction, which will be described in detail below. The diffractive optical element 10 is disposed downstream of the segmented light source array 20 in the optical path, and receives the light beams emitted from the plurality of light source arrays and projects a uniform light field on the object surface OB.
Fig. 2 shows a schematic view of the front face of a segmented light source array 20. As shown in fig. 2, the partitioned light source array 20 includes a plurality of light source arrays 20-1, 20-2, …, 20-n with a spacing between adjacent light source arrays, for example due to process limitations, as shown in fig. 2, with a spacing DS between light source arrays along a first direction (vertical direction in the figure). The array of light sources includes, for example, a plurality of vertical cavity surface emitting lasers.
Inside each light source array, the interval between adjacent light sources (or light emitting points) is small, so that the light beams emitted by each light source can be overlapped after being modulated by the diffractive optical element 10, thereby projecting a relatively uniform light field. The spacing DS between adjacent light source arrays is typically larger than the distance between adjacent light sources (or light exit points) within the same light source array. If the diffractive optical element 10 does not perform a special optical modulation, then there will be a plurality of shadow areas along the second direction in the light field projected on the object surface OB
The diffractive optical element 10 has a microstructure surface on which at least one microstructure pattern unit of various phase distributions is disposed. According to the present invention, the microstructure pattern unit is configured to disperse and uniformly modulate the light beams emitted from the light sources in the plurality of light source arrays along the first direction, so that the light field areas of the adjacent light source arrays on the object surface OB are adjacent to or overlapped with each other in the first direction, thereby the light beams emitted from the divisional light source array 20 can be projected to form a uniform light field on the object surface OB through the diffractive optical element 10, and the shadow area that may be brought by the interval between the adjacent light source arrays is eliminated.
Fig. 3 shows a partially enlarged view of the segmented light source array 20 and illustrates how the diffractive optical element 10 modulates the light emitted from each light source. As shown in fig. 3, there are shown light source arrays 20-1 and 20-2 with a spacing DS therebetween along the first direction. The diffractive optical element 10 receives the light beams from the light source arrays 20-1 and 20-2, and performs divergence and dodging modulation processing on the light beams along a first direction, so that the portion corresponding to the interval DS in the outgoing light field is covered by a uniform light field after modulation. As shown in fig. 3, for each light beam of the light source, the diffractive optical element 10 spreads it divergently along the first direction (as shown by a plurality of rectangular boxes in fig. 3), and performs dodging modulation in the divergence range. The degree to which the diffractive optical element 10 divergently widens the light beam may be determined according to the working distance L between the diffractive optical element 10 and the target surface, for example, so that when projected onto the target surface, the corresponding light fields of two adjacent light source arrays can at least abut, as in the case shown in fig. 3, thereby eliminating the shadow region that the spacing DS between the adjacent light source arrays may form in the target light field. Fig. 4 shows a light field distribution projected according to a preferred embodiment of the present invention.
The diffractive optical element 10 in the embodiment of fig. 1 can be realized by one piece of DOE. A schematic diagram of a zoned dodging projection system 100 is shown in fig. 1, with a working distance L between the diffractive optical element 10 and the target surface of, for example, 1500 mm. Since the distance S between the diffractive optical element 10 and the zoned light source array 20 is very close, only a few millimeters, the target light field can be considered approximately as being imaged at infinity. As shown in fig. 2, since the segmented light source array 20 is segmented into one row and there is no gap between the segments in the horizontal direction, the diffractive optical element 10 functions as a dodging sheet, and performs dodging at an angle matching the target light field FOV, for example, 50 to 80 degrees, for each light emitting point (20 degree FOV) of the VCSEL. In the vertical direction, because of the gaps between the subareas, the diffractive optical element 10 has optical power, limits the divergence angle of the light beam emitted by the light-emitting point in the vertical direction, which is equivalent to the function of a cylindrical mirror, and performs light evening in the limited divergence angle area, so that the light emitted by the light-emitting points at the edges of two adjacent subareas are spliced or overlapped with each other on the target light field to cover the target light field area corresponding to the subarea gap. It is understood that the diffractive optical element 10 has the above three functions, i.e., dodging light in the second direction; diverging along a first direction; along the first direction. For the above three functions, the phase distributions of the diffractive optical element 10 that realizes the corresponding functions can be calculated respectively and differently, and then the calculated phase distributions are superimposed to design the overall phase distribution of the required diffractive optical element 10 device.
In the embodiment of fig. 2-4, the plurality of light source arrays are spaced along a first direction, and the diffractive optical element 10 receives the light beams from the light source arrays and diverges and dims the light beams along the first direction to eliminate the spacing along the first direction. The present invention is not limited thereto. Fig. 5 illustrates an embodiment in which a plurality of light source arrays have a spacing along both the first direction and the second direction. As shown in FIG. 5, the segmented light source array 20 includes a plurality of light source arrays 20-1, 20-2, …, 20-n, where adjacent light source arrays have a first spacing DS1 along a first direction and a second spacing DS2 along a second direction, where the first direction is perpendicular to the second direction.
Fig. 6 shows a schematic diagram of the modulation performed by the diffractive optical element 10 corresponding to fig. 5. As shown in fig. 6, the microstructure pattern unit of the diffractive optical element 10 is configured to disperse and dodge the light beams emitted by the light sources in the plurality of light source arrays along the first and second directions, so that the light field areas of the adjacent light source arrays on the target surface are adjacent to or overlap each other in the first and second directions. The rectangles in fig. 6 identify the manner in which the diffractive optical element 10 modulates the light beam emitted by each light source. Specifically, the diffractive optical element 10 diverges and dodges the light beam in the first direction so that the light fields formed on the target surface OB by adjacent light source arrays are at least adjacent in the first direction, eliminating the shadow region; in addition, the diffractive optical element 10 diverges and dodges the light beam in the second direction such that the light fields formed on the object surface OB by adjacent light source arrays are at least adjacent in the second direction, eliminating the shadow region.
In order to achieve the divergence of the light beams of each light source array in the first direction and/or the second direction, the diffractive optical element 10 may have optical power along the first direction and/or the second direction, and the plurality of microstructure pattern units are configured to be optically uniform modulated within the divergence range, so as to ensure that the brightness of the projected light field is as uniform as possible.
In addition, when the aspect ratio of the zoned light sources and the aspect ratio of the target light field are different, the diffractive optical element has different optical powers in the first and second directions, i.e., the degrees of divergence in the first and second directions are different, so that the ratio of the zoned light source array to the light field area on the target surface in the first and second directions is matched.
For the segmented light source array shown in fig. 5, the diffractive optical element 10 may preferably also be implemented by one DOE. Because the partitioned light source array has gaps between the partitions in the horizontal and vertical directions, the DOE is required to have optical power in both directions, the divergence angle of the light beam emitted by the light emitting point is limited in the horizontal and vertical directions, which is equivalent to the function of a lens, and the light is homogenized in the limited divergence angle region, so that the light emitted by the light emitting points at the edges of two adjacent partitions are spliced or overlapped on the target light field to cover the target light field region corresponding to the partitioned gap. In designing a diffractive optical element, for the above functions, phase distributions of the DOE implementing the corresponding functions may be calculated respectively (for example, the fresnel lens provides optical power, and a random phase structure is used for light homogenization), and then the calculated phase distributions are superimposed to design an overall phase distribution of the desired DOE device. In addition, when the proportion of the light emitting area of the VCSEL in the horizontal and vertical directions is different from the proportion of the target light field, the DOE may provide different optical powers (saddle-shaped phase distribution) in the two directions to correct the proportion of the light emitting area of the VCSEL to match the target light field.
The partitioned dodging projection system and the diffractive optical element according to the embodiments of the present invention are described above. The partitioned dodging projection system can be arbitrarily combined into electronic equipment needing dodging projection, and the partitioned dodging projection system comprises but not limited to a mobile phone, a PAD, an electronic lock and the like.
Fig. 7 illustrates a method 200 for designing a diffractive optical element according to an embodiment of the present invention, which is described in detail below with reference to fig. 7. As shown in fig. 7, the design method 200 includes:
in step S201, parameters of a partitioned light source array including a plurality of light source arrays having a spacing in a first direction, such as partitioned light source array 20 shown in fig. 2, are obtained. The parameter comprises a width of the space DS in the first direction.
In step S202, parameters of a target light field on a target surface are obtained, including distances of the target light field from the partitioned light source array.
In step S203, parameters of the diffractive optical element are calculated, so that the diffractive optical element can diverge and dodge the light beams emitted by the light sources in the plurality of light source arrays along the first direction, so that light field areas of adjacent light source arrays on the target surface are adjacent to or overlap each other in the first direction.
According to an embodiment of the present invention, the plurality of light source arrays have a spacing along a second direction, the second direction being perpendicular to the first direction, such as the partitioned light source array shown in fig. 5. Wherein the step S203 includes: parameters of the diffractive optical element are calculated so that the diffractive optical element can diverge and dodge the light beams emitted by the light sources in the plurality of light source arrays along the second direction so that light field areas of adjacent light source arrays on the target surface abut or overlap each other in the second direction.
According to an embodiment of the present invention, the step S203 includes:
calculating a first phase profile of the diffractive optical element, the first phase profile providing optical power such that the light beams of each light source array diverge in a first direction and/or a second direction;
calculating a second phase distribution of the diffractive optical element, wherein the second phase distribution can enable the light beams of each light source array to be subjected to dodging modulation in the divergence range of the first direction and/or the second direction; and
the first phase distribution and the second phase distribution are superimposed.
According to an embodiment of the present invention, the step S203 includes: and calculating different optical powers of the diffractive optical element in the first direction and the second direction according to the proportion of the subarea light source array in the first direction and the second direction and the proportion of the target light field in the first direction and the second direction, so that the subarea light source array is matched with the proportion of the target light field in the first direction and the second direction.
The present invention also relates to an optical modulation element designed by the design method 200 as described above.
The above describes the preferred embodiment of the present invention, wherein the VCSEL light source array can be partitioned in one row or in two rows, which can provide different solutions. For example, a VCSEL light source is divided into 1 × 12 or 2 × 8 segments, gaps exist between adjacent segments, the light source segments are alternately lit, when each light source segment is lit, only the region corresponding to the segment in the target light field is uniformly illuminated, and when all the segments are lit together, the entire target light field is uniformly illuminated without dark regions due to the gaps between the segments. When the light source 1 column is segmented, segmented illumination can be achieved by a single DOE. When the light source is divided into 2 rows, a single-DOE scheme can be used to realize the divisional uniform illumination of the target light field.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A diffractive optical element comprising a microstructured surface on which at least one microstructured pattern element is disposed, the diffractive optical element being capable of receiving light beams emitted by a partitioned light source array and projecting a light field on a target surface, wherein the partitioned light source array comprises a plurality of light source arrays spaced apart along a first direction, and the microstructured pattern element is configured to disperse and homogenize light beams emitted by light sources in the plurality of light source arrays along the first direction such that light field areas of adjacent light source arrays on the target surface abut or overlap each other in the first direction.
2. The diffractive optical element according to claim 1, wherein the plurality of light source arrays are spaced apart along a second direction, the second direction being perpendicular to the first direction, wherein the micro-structure pattern unit is configured to diverge and dodge light beams emitted by light sources of the plurality of light source arrays along the second direction such that light field areas of adjacent light source arrays on the target surface abut or overlap each other in the second direction.
3. The diffractive optical element according to claim 1 or 2, wherein the diffractive optical element has an optical power such that the light beam of each light source array diverges in a first direction and/or a second direction, and the microstructure pattern unit is configured to be optically uniform modulated in a divergence range.
4. The diffractive optical element according to claim 2, wherein said diffractive optical element has different optical powers in a first direction and a second direction to match the ratio of the zoned light source array to the light field area on the target surface in the first direction and the second direction.
5. A zoned dodging projection system, comprising:
a zoned light source array comprising a plurality of light source arrays having a spacing along a first direction;
the diffractive optical element as claimed in any one of claims 1 to 4, disposed in the optical path downstream of said partitioned light source arrays and adapted to receive the light beams emitted by said plurality of light source arrays and project a light field on a target surface.
6. An electronic device comprising the zoned dodging projection system of claim 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020929985.7U CN213843575U (en) | 2020-05-27 | 2020-05-27 | Diffractive optical element, zoned uniform light projection system, and electronic apparatus |
| PCT/CN2021/093807 WO2021238678A1 (en) | 2020-05-27 | 2021-05-14 | Diffractive optical element, partitioned uniform light projection system, electronic device and design method |
| US18/059,040 US20230092042A1 (en) | 2020-05-27 | 2022-11-28 | Diffractive optical element, partitioned uniform light projection system, electronic device and design method |
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| CN202020929985.7U CN213843575U (en) | 2020-05-27 | 2020-05-27 | Diffractive optical element, zoned uniform light projection system, and electronic apparatus |
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